99.53% is the change from 422 to 842
Calculation steps:
[( 842 - 422 ) ÷ 422] x 100 = 99.53%
Formula
Percentage change = [(842 - 422) / 422] x 100
Subtract the new number by the original number
842 - 422 = 420
420 ÷ 422 = 0.995260663507109
0.995260663507109 x 100 = 99.53%